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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5840b2d7049a9c2b75da38a05c84558dc3fe944cf9129592f32c87d71c001269' 
  AND token = 'yEoPCqgbLpKA1G6Th1yf6EUETqi49KZPQDZw6sSkR7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}